Synthesis of spiro[2H-indole-2,1′-1H-isoindole]-3,3′-diones, spiro[1H-isobenzofuran-1,2′-2H-indole]-3,3′-diones and spiro[benzofuran-2,1′-isobenzofuran]-3,3′-diones via transannular reactions of eight membered ring intermediates

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